I don't really want to switch to lifting weights, because I don't know how to do it right and can't really afford to join a gym or get some sessions with personal trainer to learn how to do it properly. And really the swiss ball I've gotten to do some of the PT stuff at home was already more fitness equipment than I ever expected to own.

I mean, my health insurance covered the PT and most of the cost for the back exercises class, and I feel confident enough with the sample exercises and the general instructions from there that I know what to watch out for to probably not injure myself with my own body when I try to follow some additional bodyweight exercises, and we did some basics with resistance bands too, though I haven't really tried that at home yet. But I want to stick with that kind of exercise for now, rather than doing a different thing.

I'd just like some more tangible markers for progress. Like when doing abdominal crunches I can actually see some progress: initially I could barely do any, but now I can finish two proper sets of the easier variant (where you cross the arms over your torso rather than behind your head) and might be able to switch to the regular ones soon. So I can see I'm getting better with that exercise.